'\" t
.\"     Title: unix_chkpwd
.\"    Author: [see the "AUTHOR" section]
.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/>
.\"      Date: 11/22/2024
.\"    Manual: Linux-PAM Manual
.\"    Source: Linux-PAM
.\"  Language: English
.\"
.TH "UNIX_CHKPWD" "8" "11/22/2024" "Linux\-PAM" "Linux\-PAM Manual"
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.SH "NAME"
unix_chkpwd \- Helper binary that verifies the password of the current user
.SH "SYNOPSIS"
.HP \w'\fBunix_chkpwd\fR\ 'u
\fBunix_chkpwd\fR [\&.\&.\&.]
.SH "DESCRIPTION"
.PP
\fIunix_chkpwd\fR
is a helper program for the
\fIpam_unix\fR
module that verifies the password of the current user\&. It also checks password and account expiration dates in
\fIshadow\fR\&. It is not intended to be run directly from the command line and logs a security violation if done so\&.
.PP
It is typically installed setuid root or setgid shadow\&.
.PP
The interface of the helper \- command line options, and input/output data format are internal to the
\fIpam_unix\fR
module and it should not be called directly from applications\&.
.SH "SEE ALSO"
.PP
\fBpam_unix\fR(8)
.SH "AUTHOR"
.PP
Written by Andrew Morgan and other various people\&.
